Piston ring



Dec 1923. H E REAUME 1,478,486.

PISTON RING Filed June 8, 1922 l l l a: l I 1 1 8 l \ESUIH Elf ll l llilHX! llllll Vali Fg z will I 1 1 1W8 Fla 5 Harry fifleawmte InventorPatented Dec. 25, 1923.

UNET TTE' t an arnr ease.

HARRY E. REAUME, F DETROIT, MICHIGAN.

PISTON RING.

Application tiled June 8,

To all whom it ma concern:

Be it known that HARRY E. REAUME, a citizen of the United States,residing at Detroit, county of Wayne, State of Michigan, haveinvented acertainnew and useful Improvement in- Piston Rings, and declare thefollowing to be a full, clear, and exact description of the same, suchas will enable others skilled in the art to which it pertains to makeand use the same, reference bein in iurther, an object is to provide apacking ring so formedthat. the gases under compression are utilized tohold the ring outwardly against the cylinder wall, making so aclose-fitting joint therewith.

These and other objects, together with the details of construction andmethod of operation will more fully appear from the followingdescription, appended claim and accompanying drawing, in which:

Figure 1 isa side elevation, partly broken away, of a piston carrying myimproved rin disposed within the cylinder.

ig. 2 is a sectional elevation of the small- 40 or section of myimproved ring.

Fig. 3 is a sectional elevation of the larger section of my im rovedring.

11am aware t at rings have been previouslyprovided which attempted tomake use of the gases under compression to provide a tight fitting jointbetween the ring and the wall of the cylinder. So far as I know,however, these rings difier essentially from my construction here shown.My improved ring presents a large bearing surface to the wall of thecylinder. The ring is so shaped as to make use of the gases undercompression to hold the same outwardly against the cylinder wall. Thedetails of the construc tion of the separate ring sections of the 1922.Serial No. 568,878.

combination and their assembly ton follow.

llnthe drawing, let 5 indicatea pistonand 6 the cylinder wall onopposite sides. The piston shown is provided with a pair ofsubstantially parallel annular ring grooves within which are positionedpiston rings hereinafter described. Each complete ring comprises a largering section 7 and a small ring section 8. The large ring secon the pis-'tion '7 has an outer face substantially the width of the groove whichbears against the cylinder wall. This large ring section is undercutfrom the edge at the cylinder wall inwardly and downwardly to a point 9well within the groove. As shown in the drawing, this large ring sectionisundercut on a bevel to a oint approximately midway its height andlateral width within the groove. 4

I provide a second ring section 8 which is substantially rectangular incross section and which is seated within the groove along,- side thelarge ring section below the bevel thereof and adapted to hold the largering section side'wise within the groove against the opposite side wallof the groove.

As shown in F ig. 1, when the ring is within the groove and the pistonis working, the gases under compression in the combustion chamber willenter the annular groove formed by'the undercut beveled faces of thelarge ring section and will serve to hold such large section outwardlyagainst the cylinder wall and laterally against the opposite side wallof the groove so as to prevent leakage of gas between the packing ringand the cylinder wall or underneath the packing ring and through thegroove. The ring section might preferably be made of-resilient materialhaving a certainoutwardly ex ansive tendency to assist this action of te gas under compression and to maintain a tight fitting joint betweenthe packin ringand the cylinder wall under norma non-working conditions.The large ring section is shown as beveled to a comparatively sharp.edge at the cylinder wall. and when the ring becomes heated the gasesunder compression will hold this edge closely in engagement with thewall of the cylinder in conformity with any irregularities in thecontour thereof. The gases will also wedge this section 7 sidewisewithin the groove against the opposite side wall of the groove toprevent leakage of gas around the arge section within the groove andwill hold the small ring section against the bottom of the groove andagainst the large ring section.

As shown in Fig. 1, there is positioned in the lower groove a packin rinsimilar in construction to that hereto ore escribed but in which thebevel faces in the opposite direction. The outer ring section possessessufiicient resilienc to hold itself outwardly against the cylin er wall,though it is apparent that spring means of an well known orm might beused to accomplish this purpose, if desired. The annular grooveunderneath the undercut face of this large ring section serves as an oilgroove. This o1lgrooveis of sufiicient size to form a perfect seal whenoil is collectedtherein and would effectively prevent oil reaching thecombustion chamber from the cylinder. It will be seen, therefore, thatin the assembly shown I have provided packing rings so arranged as toprevent leakage of the compression gases either through the groove orbetween the packing ring and the .wallof the cylinder and also preventleakage of oil into the combustion chamber portion of the cylinder.

ava-tee What I claim is: I

In piston packing, in. combination, a cylinder, a pistion having anannular groove, which piston is disposed in said cylinder for working,packing in said groove comprising a ring section having an outer facesubstantiall the width of the groove bearing against the cylinder wall,which ring section is undercut on a bevel from such outer face toapproximately the center of the ring which point is approximately thecenter of the groove when the ring is disposed therein and then cut awayfrom such point to its inner face on a line sub,- stantially parallelthe opposite lateral face of the ring which engages 'a side wall of thegroove, and a second ring section substantially1 rectangular in crosssection seated tween a side wall thereof, the outer faceof the secondring section and the beveled face of the first ring section.

In testimony whereof, I sign this specification.

HARRY E. BEAUME.

